Measurement of the inclusive isolated-photon production cross section in pp and Pb-Pb collisions at root sNN=5.02 TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00388907" target="_blank" >RIV/68407700:21340/25:00388907 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1140/epjc/s10052-025-13971-y" target="_blank" >https://doi.org/10.1140/epjc/s10052-025-13971-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjc/s10052-025-13971-y" target="_blank" >10.1140/epjc/s10052-025-13971-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Measurement of the inclusive isolated-photon production cross section in pp and Pb-Pb collisions at root sNN=5.02 TeV

Popis výsledku v původním jazyce

The ALICE Collaboration at the CERN LHC has measured the inclusive production cross section of isolated photons at midrapidity as a function of the photon transverse momentum (p(T)(gamma)), in Pb-Pb collisions in different centrality intervals, and in pp collisions, at centre-of-momentum energy per nucleon pair of root s(NN) = 5.02 TeV. The photon transverse momentum range is between 10-14 and 40-140 GeV/c, depending on the collision system and on the Pb-Pb centrality class. The result extends to lower p(T)(gamma) than previously published results by the ATLAS and CMS experiments at the same collision energy. The covered pseudorapidity range is |eta(gamma)| < 0.67. The isolation selection is based on a charged particle isolation momentum threshold p(T)(iso,ch)=1.5 GeV/c within a cone of radii R=0.2 and 0.4. The nuclear modification factor is calculated and found to be consistent with unity in all centrality classes, and also consistent with the HG-PYTHIA model, which describes the event selection and geometry biases that affect the centrality determination in peripheral Pb-Pb collisions. The measurement is compared to next-to-leading order perturbative QCD calculations and to the measurements of isolated photons and Z(0) bosons from the CMS experiment, which are all found to be in agreement.

Název v anglickém jazyce

Measurement of the inclusive isolated-photon production cross section in pp and Pb-Pb collisions at root sNN=5.02 TeV

Popis výsledku anglicky

The ALICE Collaboration at the CERN LHC has measured the inclusive production cross section of isolated photons at midrapidity as a function of the photon transverse momentum (p(T)(gamma)), in Pb-Pb collisions in different centrality intervals, and in pp collisions, at centre-of-momentum energy per nucleon pair of root s(NN) = 5.02 TeV. The photon transverse momentum range is between 10-14 and 40-140 GeV/c, depending on the collision system and on the Pb-Pb centrality class. The result extends to lower p(T)(gamma) than previously published results by the ATLAS and CMS experiments at the same collision energy. The covered pseudorapidity range is |eta(gamma)| < 0.67. The isolation selection is based on a charged particle isolation momentum threshold p(T)(iso,ch)=1.5 GeV/c within a cone of radii R=0.2 and 0.4. The nuclear modification factor is calculated and found to be consistent with unity in all centrality classes, and also consistent with the HG-PYTHIA model, which describes the event selection and geometry biases that affect the centrality determination in peripheral Pb-Pb collisions. The measurement is compared to next-to-leading order perturbative QCD calculations and to the measurements of isolated photons and Z(0) bosons from the CMS experiment, which are all found to be in agreement.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/LM2023040" target="_blank" >LM2023040: Výzkumná infrastruktura pro experimenty v CERN</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Physical Journal C

ISSN

1434-6044

e-ISSN

1434-6052

Svazek periodika

85

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

35

Strana od-do

—

Kód UT WoS článku

001498568000001

EID výsledku v databázi Scopus

2-s2.0-105012429848